package com.Fen.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.Fen.constant.MessageConstant;
import com.Fen.dto.UserLoginDTO;
import com.Fen.entity.User;
import com.Fen.exception.LoginFailedException;
import com.Fen.mapper.UserMapper;
import com.Fen.properties.WeChatProperties;
import com.Fen.service.UserService;
import com.Fen.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //微信服务接口地址
    private static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    @Override
    public User vxLogin(UserLoginDTO userLoginDTO) {

        String openid=getOpenid(userLoginDTO.getCode());

        //判断用户的openid是否为空
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断用户是否为新用户
        User user=userMapper.getByOpenid(openid);

        //如果为新用户，则创建用户信息，并返回用户信息
        if(user==null){
           user= User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
           userMapper.insert(user);
        }

        //如果为老用户，则直接返回用户信息
        return user;
    }

    private String getOpenid(String code){
        //调用微信接口服务，获得当前用户的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json=HttpClientUtil.doGet(WX_LOGIN,map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
